That Leonard Nimoy sure likes to talk a big game about retiring from acting, but leave it to the eggheads of 'The Big Bang Theory' to engineer a way for the legendary sci-fi actor to make an appearance.

That's right, 'Bang' theorists, we're all about to live a bit prosperously longer when former 'Star Trek' star Leonard Nimoy finally makes his presence known on an upcoming March 29 episode of 'The Big Bang Theory,' according to a new TVLine report.   

Technically speaking, Nimoy will keep his vow of retirement from acting, as the actor will only lend his voice to the series, appearing in voice-over (as Spock, of course) in a dream sequence of Sheldon (Jim Parsons)'s.

For those unfamiliar with the series, Leonard Nimoy (and Spock, of course) has long been a heroic figure of Sheldon Cooper's, going so far as to freak out over Penny (Kaley Cuoco)'s one-time Christmas present of a napkin autographed by the sci-fi legend.  A more recent outing in the 100th episode saw Sheldon placing an order for a life-size cutout of his 'Star Trek' hero, only to find that the mock-up was that of the 2009 Zachary Quinto incarnation of the character.

Nimoy joins the long list of 'The Big Bang Theory' guest stars from science fiction and pop culture, notably including Nimoy's one-time 'Star Trek' co-star George Takei, who also appeared in an imagined cameo within the mind of Howard Wolowitz (Simon Helberg) along with 'Battlestar Galactica' star Katie Sackhoff.

For years producers of 'The Big Bang Theory' have sought to secure Nimoy as a guest star on the series, but haven't been able to coax him out of semi-retirement until now.  Evidently, 'The Big Bang Theory' is no Bruno Mars video.  Nimoy also lent his voice to an episode of 'Fringe' last season, as well as Hollywood blockbuster 'Transformers: Dark of the Moon.'

What say you, 'Big Bang'ers?  Does the casting of Leonard Nimoy fulfill your nerdiest dreams, or are you holding out for an in-person appearance?  Who would you like to see on the favored CBS sitcom?  I'd vote Nathan Fillion!  Let us know your thoughts in the comments below!